*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    background: linear-gradient(#2b1055,#7597de);
    min-height: 100vh;

    overflow-x: hidden;
    scroll-behavior: smooth;
}
header{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 30px 100px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
}
header #logo{
    color: #fff;
    text-decoration: none;
    font-size: 2em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
}
header ul{
    display: flex;
    justify-content: center;
    align-items: center;
}
header ul li{
    list-style: none;
    margin-left: 20px;
}
header ul li a{
    text-decoration:none;
    color: #fff;
    padding: 6px 25px;
    border-radius: 20px;
}
header ul li a:hover,
header ul li a.active{
    background-color: #fff;
    color: #2b1065;
}
section{
    position: relative;
    width: 100%;
    height: 100vh;
    padding: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;

}
section::before{
    content: '';
    position: absolute;
    bottom: 0;
    height: 100px;
    width: 100%;
    background: linear-gradient(to top,#1c0522,transparent);
    z-index: 1000;
    
}
section img{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
}
section img#moon{
    mix-blend-mode: screen;/*设置背景融合方式*/
}
section img#mountain_front{
    z-index: 15;
}
section #text{
    position: absolute;
    color: #fff;
    font-size: 7.5vw;
    white-space: nowrap;
    z-index: 10;
    transform: translateY(100px);
    right: -350px;
}
section #btn{
    text-decoration: none;
    color: #2b1055;
    padding: 8px 30px;
    border-radius: 20px;
    background-color: #fff;
    font-size: 1.5em;
    z-index: 10;
    display: inline-block;
}
.sec{
    position: relative;
    padding: 100px;
    background-color: #1c0522;
    z-index: 200px;
}
.sec h2{
    font-size: 3.5em;
    color: #fff;
    margin-bottom: 10px;
}
.sec p{
    color: #fff;
    font-size: 1.2em;
}